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Give the general form of SQL query?
Select A1, A2............., An
From R1, R2..............., Rm
Where P
what is Mapping Constraints? with examples
State as Location within a Program In this traditional approach, location of control inside a program totally defines the program state. Any finite state machine may be implem
When a function module is activated syntax checking is performed automatically. YEs, a function module is activated syntax checking.
Cardinality shows the number of instances of an entity associated with another entity participating in a relationship. Depend on the cardinality binary relationship can be further
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
Before we talk about the relational model in more detail, let us first define some very basic terms used in this model. Tuple Every row in a table shows a record and is cal
Databases and data warehouses both are databases and both contains number of rows and columns of tables containing data. Data warehouse is really different from databases because d
Where does view definition stored? A view definition is permanently stored as part of the database.
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
Q. Define a weak entity set and its identifying relationship. List the necessary conditions for a meaningful identifying relationship set of a weak entity set. Entity is a t
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